From my experience,............. don't freak out if they don't eat for the first week. I was concidering returning him because he wouldn't eat. Rather have him live and go to someone else then die on me. They're real docile, and pretty much stay almost motionless all the time. I'm reeeeeaally happy with my yellow tail. He don't mess with no one, eats well, and he's the fastest, I mean THE FASTEST in my tank. First he started off only eating feeders then I got him now eating frozen squid, anchovie and silver sides. I've only had him for about a month. Him and my VATF are my two fav fish. They got the nastiest grills too.